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이용두 대구대학교 산업기술연구소 1987 産業技術硏究 Vol.6 No.-
The specialized braille texts and materials for education of the blind could be produced by the limited number of proficient braillists and the manual production of braille showed inappropriateness in time and cost. As the domestic computer science has been advanced and many microcomputers have been manufactured and distributed in recent years, there would be the increasing possibility to conatruct a system utilizing the computer. Therefore, in this research we'd like to develop a microcomputerized braille translation system which will record rules, formulas, and principles of braille both in Korean and in English, numerals, and other braille codes through its keyboard. The braille will be edited and corrected in CRT display and will be stored in the forms of cassette tapes or floppy disks. The results of this research proved that this system could transcribe the standard braille in Korean and in English without errors at the rate of 8 CPS. It means that is almost five times faster than manual braille printing machine. Therefore, this system can produce braille materials at much lower cost.
이용두 한국지하수토양환경학회 2001 지하수토양환경 Vol.5 No.3
본 연구는 제주도의 전체 지하수공 중 수역별로 대표성이 있는 150공을 선정하여 고도에 따른 수질 특성을 파악하는데 목적을 두었다. 수질특성의 평가는 물리.화학적 특성과 통계분석을 이용하였다. Piper diagram에 의한 수질 유형은 표고 50m이하 지역은 $Na^{+}$+ $K^{+}$-C $l^{-}$ 형태를 보이고 있다. 40~100 m에 위치한 지하수에서는 $Na^{+}$+ $K^{+}$-HC $O_3$$^{-}$ +C $O_3$$^{2-}$ 형태와 일부 $Na^{+}$+ $K^{+}$-C $l^{-}$ 형태의 군을 이루고 있다. 그리고 100 m이상의 지역에서는 $Na^{+}$+ $K^{+}$-HC $O_3$$^{-}$ +C $O_3$$^{2-}$ 형태에 속하고 있다. 요인분석 결과, 50 m이하와 100 m이상 지역에서 공통적으로 TDS와 오염물질 2개 요인이 추출되었다. 50~100m지역에는 3개의 요인이 추출되었으며, 요인1에는 TDS함량으로 요인2는 오염의 영향과 광물용해로 볼 수가 있다. 그리고 요인 3에는 HC $O_3$$^{-}$ 함량으로 나타났다.. This study purpose to elucidate the characteristics of water quality by elevation and groundwater samples has been studied with the samples from 150 selected groundwater represented the watershed of groundwater wells in Cheju Island. The evaluation of the characteristics of water quality utilized the physical and chemical property and the statistical analysis. According to the piper diagram, groundwater in the under 50 m region is shown N $a^{+}$+ $K^{+}$-C $l^{[-10]}$ type, and that groundwater in the 50~100 m region is shown N $a^{+}$+ $K^{+}$-HC $O_3$$^{[-10]}$ +C $O_3$$^{2-}$ type. and partly N $a^{+}$+ $K^{+}$-C $l^{[-10]}$ type. In the above 100 m region belongs to N $a^{+}$+ $K^{+}$-HC $O_3$$^{[-10]}$ +C $O_3$$^{2-}$ type. The result of factor analysis, commonly two factors as TDS(Total Dissolved Solid) and the contaminants extracted in the under 50m region and above 100 m region. Three factors were obtained from the result of the factor analysis in the 50~100 m region. Factor 1, consisting of TRS content. Factor 2, consisting of the contaminant and the dissolution of minerals. and Factor 3, consisting of HC $O_3$$^{[-10]}$ content. content.
이용두,조은일,강봉권 한국수처리학회 2008 한국수처리학회지 Vol.16 No.1
The observation of Algae showed that Aug. 23 through Sept. 10, dominant species is Cyanobacteria containing toxic materials, Anabaena spiroides, and Chlorophyll-a is 106.82㎍/ℓ~549.90㎍/ℓ. Stirring from Sept. 14, Microcystis areuginosa is dominant species, and the concentration is 61.17㎍/ℓ~1628.84㎍/ℓ. It is higher than Chlorophyll-a concentration in other lakes or reservoirs about 10~40 times. The comparative experiment of ultrasound frequency(40kHz, 28kHz) and power(40W, 80W, 120W) showed that the frequency is low as the finding of existing studies, and with power in high condition, the removal efficiency of Chlorophyll-a was high. But in case of high-concentration Chlorophyll-a, it sustained a constant value without any change 30 minutes after exposure in spite of high power, 120W. The ON/OFF experiment of ultrasound with power at 28kHz, 120W and exposure time between 30~120 minutes to explore the effect of ON/OFF during the exposure time of the ultrasound wave generator on the removal efficiency of algae showed that the removal efficiency was kept regardless of ON/OFF time. It can save 30-minute power and periodical exposure of ultrasound waves contributes to removal efficiency.